Detecting the right moment of estrus in witch ovulation occurs it is extremely important for mare's biotechnology reproductive management and especially for mare breeding soundness evaluation. Endoscopic examination of mare's reproductive tractus makes possible the visualization of the vagina, the external cervical ostium, the lumen of the uterine body and the horns up to the uterotubal junctions, in order to obtain a large amount of information related with mares reproductive status. The endoscopic reproductive examination was performed at the Faculty of Veterinary Medicine Bucharest, for 15 mares from different races, examined for a research study concerning the best ways to monitor the ovulation. The examination was performed with a Olympus GIF K2, a flexible endoscope.